Abstract：Based on GPS near field displacements and teleseismic P waves, this paper applies finite fault inversion method to inverse the fault rupture process of 202-07-29 Alaska MW8.2 earthquake. The result shows that the duration of the earthquake is about 100 s and the seismic moment is about 1.59×1021 Nm. The fault rupture slip extends from the epicenter along the fault to the NEE direction, and the magnitude of fault slip is larger in the northeast side of the epicenter. The surface deformation of the earthquake is analyzed by GPS data and dislocation theory model. It is considered that the coseismic deformation is consistent with the elastic rebound model of megathrust earthquakes. Due to the fault locking, the Pacific plate subducted the north American plate, so that the upper north American plate is continuously squeezed for a long time. At the time of the earthquake, the North American plate immediately changed into tension relaxation.
